3. AN OVERVIEW OF SOFTWARE DEFINED RADIO II-9Software Defined Radio: An Introduction II-9Need for Software Defined Radio II-9Evolution of Software Defined Radio II-9SpeakEasy Phase I II-10SpeakEasy Phase II II-10Components of SDR II-11Types of SDRs II-12Ideal Software Defined Radio II-12High Frequency Software Defined Radio (HFSDR) II-13Baseband Software Defined Radio (BBSDR) II-13Operating Principles II-13Ideal Concept II-13Receiver Architecture II-13Current Applications II-14Joint Tactical Radio System II-14Amateur or Home Application II-14Advantages of SDR II-15Advantages of SDR for Mobile Operators II-15Comparative Study II-16Comparison of SDR with Other Radios by Application II-16Comparison of SDR with other Radios by Design II-16Comparison of SDR with other Radios by Upgrade Cycle II-16Comparison of SDR Using General-Purpose DSP and ASIC II-17

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